US4342848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing modifier for high-density polyethylene
Assignee: Dow Chemical Co
•
Filing: 1981-07-20
•
Granted: 1982-08-03
•
Expires: 2001-07-20
Abstract
Abstract The use of polyvinyloctadecyl ethers as a processing modifier in the extrusion of high-density polyethylene resins leads to a smoother surface of the extruded resin. Other beneficial effects include improved values of such important resin characteristics as tensile strength at break, percentage elongation at break, tearing resistance, and impact resistance.
Inventors
- 👤 Robert R. Blanchard
- 👤 Tommy R. Bourne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:52
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; B; B29; B29C; B29C48/00; B29C48/022; C08L23/04; C08L23/06; C08L23/10; C08L71/00; B29C48/03; B29C48/04; B29C48/09; B29C48/10; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0608; B29K2023/0641; B29K2995/00; B29K2995/0037; B29K2995/0063; C08L2207/00; C08L2207/06; C08L2207/062
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
56 words
A process for extruding high-density polyethylene resins, comprising the steps of: (a) heating above its melting point a mixture comprising about one hundred parts by weight of high-density polyethylene, and between about 0.03 and about 0.5 parts by weight of a polyvinyloctadecyl ether; and (b) extruding the melt formed in step (a), thereby forming an extrudate.
Claim 2
Dependent Claim
56 words
A process for extruding high-density polyethylene resins, comprising the steps of: (a) heating above its melting point a mixture comprising about one hundred parts by weight of high-density polyethylene, and between about 0.03 and about 0.5 parts by weight of a polyvinyloctadecyl ether; and (b) extruding the melt formed in step (a), thereby forming an extrudate.
Claim 3
Dependent Claim
31 words
The process of claim 1, wherein the mixture comprises about one hundred parts of the high-density polyethylene, and between about 0.1 and about 0.3 parts by weight of the polyvinyloctadecyl ether.
Claim 4
Dependent Claim
21 words
The process of claim 1, wherein the number-average molecular weight of the polyvinyloctadecyl ether is between about 1,000 and about 10,000.
Claim 5
Dependent Claim
21 words
The process of claim 2, wherein the number-average molecular weight of the polyvinyloctadecyl ether is between about 1,000 and about 10,000.
References Cited (Backward Citations)
US3069369A
Cited
US3299181A
Cited
US3265649A
Cited
US3231554A
Cited
US3488306A
Cited
US3546146A
Cited
US3657114A
Cited
US3803065A
Cited
US3879331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-02 | 1986-02-01 | 1986-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-02 | 1990-02-01 | 1990-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-02 | 1994-02-01 | 1994-08-03 | $7700.00 | Window Closed / Lapsed |